Kollel Iyun Hadaf, Jerusalem
1) What is the source for ...
(a) ... Bensching after bread?2) How does Rebbi Yochanan attempt to obligate ...
(a) ... a Berachah *after* Torah-study from Bensching?3) According to Rav Yehudah, someone who is uncertain whether he recited the Shema or not, is Patur from 'repeating' it, whereas the same Safek with regard to 'Emes ve'Yatziv' would obligate him to repeat it.
(a) Why is that?Rebbi Elazar disagrees. According to him, in case of doubt, one *is* obligated to repeat the Shema.
(d) What is his Machlokes with Rebbi Yochanan regarding someone who is not sure whether, or not, he has Davened the Amidah?4)
(a) What is the difference between someone who remembers - in the middle of the Amidah - that he has already Davened, and someone who is in the middle of the weekday Amidah, when he remembers that it is Shabbos?The author of the former Halachah is Shmuel, who also stated that someone who enters Shul and finds there a Minyan already Davening the Amidah, may not Daven again (in order to Daven Tefilah be'Tzibur), unless he is able to add something new to the Amidah.
(c) In view of the former statement, why did he need to issue the latter one?
5) According to Rav Huna, someone who enters Shul and finds the community in the middle of the Amidah, may join them, provided he is able to terminate the Amidah in time to say Modim with the community.
(a) Why?In any event, one does not interrupt the Amidah for Kedushah.
(d) Does one interrupt the Amidah in order to answer 'Amein Yehei Shemei Raba' ... ?6) According to Ben Azai, we learn the penalty of stoning by a witch, from the fact that it is placed next to bestiality, which we already know, is Chayav Sekilah.
(a) What does Rebbi Yehudah comment on that, and from where does *he* learn the penalty of stoning by a witch?There is a discrepancy between the way Rebbi Yehudah learns in (a), and the way he learns in (b).
(c) What do we learn from it?7) In a Mishnah at the end of the Perek, Rebbi Yehudah exempts a Zav (who is not subject to the above Tevilah) who afterwards saw Keri, or a Nidah (who has the Din of a Zav in this regard), who then exuded Zera, and a woman who saw blood after being Meshameshes.
(a) How does the Gemara prove from here that Rebbi Yehudah agrees on principle, with the prohibition of a Ba'al Keri to learn Torah before he has Toveled?